Ultrafast Dynamics of Optically-Induced Charge and Spin Currents in Semiconductors

Ultrafast Dynamics of Optically-Induced Charge and Spin Currents in Semiconductors
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半导体中光感电荷和自旋电流的超快动力学

DOI:
10.1007/978-3-540-38235-5_15
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
S.W. Koch
S.W. Koch
中科院分区:
--
文献类型:
--
作者:
T. Meier;H.T. Duc;Q.T. Vu;B. Pasenow;J. Hübner;S. Chatterjee;W.W. Rühle;H. Haug;S.W. Koch

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半导体和半导体纳米结构中光激发的超快动力学可以使用半导体布洛赫方程在微观理论基础上计算。这组方程允许一个非微扰评估光场诱导的带内和带间激发,也非常适合于分析多体效应,如激子共振和载流子-载流子和载流子-声子散射过程。在这篇文章中,我们首先描述的相干自旋光电流的实验观察,然后我们简要地介绍了理论的方法,并回顾了我们的理论的一些结果的微观描述的超快相干光产生和时间衰减的电荷和自旋电流在半导体纳米结构。计算的瞬态显示出增强的阻尼的自旋电流相对于电荷电流作为一个结果的库仑散射与相反的自旋之间的载流子。量子动力学记忆效应的光电流的动力学的影响进行了分析,通过评估超出马尔可夫近似的散射项。
The ultrafast dynamics of optical excitations in semiconductors and semiconductor nanostructures can be computed on a microscopic theoretical basis using the semiconductor Bloch equations. This set of equations allows one to nonperturbatively evaluate light-field-induced intraband and interband excitations and is also well suited for the analysis of many-body effects such as excitonic resonances and carrier-carrier and carrier-phonon scattering processes. In this article we start with a description of an experimental observation of coherent spin photocurrents, then we briefly introduce the theoretical approach and review some results of our theory concerning the microscopic description of the ultrafast coherent optical generation and the temporal decay of charge and spin currents in semiconductor nanostructures. The computed transients show an enhanced damping of the spin current relative to the charge current as a consequence of Coulomb scattering between carriers with opposite spin. The influence of quantum kinetic memory effects on the dynamics of the photocurrents is analyzed by evaluating the scattering terms beyond the Markov approximation.
DOI: --
发表时间: 2001
期刊:
影响因子: --
作者:
C. Schlichenmaier;I. Varga;T. Meier;P. Thomas;S. Marburg;H Germany;Budapest University of Technology;Economics;Hungary.
通讯作者: Hungary.
DOI: --
发表时间: 2001
期刊:
影响因子: --
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发表时间: 2003
期刊:
影响因子: --
作者:
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通讯作者: J. Sipe